Wash. Rev. Code § 35.17.230
Ordinances shall not go into effect before thirty days from the time of final passage and are subject to referendum during the interim except:
[ 1965 c 7 s 35.17.230. Prior: (i) 1911 c 116 s 22, part; RRS s 9111, part. (ii) 1911 c 116 s 21, part; RRS s 9110, part.]